Usman Sudjadi and R. V. Sinaga. A Descriptive Study of the Hardness and Microstructure Profiles of SKD61 Steel Plunger Tip (Local Material) after Plasma Nitriding. NAER-V4 [Internet]. 2021 Jun. 22 [cited 2026 Jun. 13];:82-94. Available from: https://stm.bookpi.org/NAER-V4/article/view/1884